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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5649fd7d965ea7421ab9b5553a74faac3fa9522afcc90c2e2030ade9ef6390b' 
  AND token = '67E2LM4NmOGqppo7EHOyhtWRYgzwCchL4jhe95j41Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}